Quarterly report pursuant to Section 13 or 15(d)

Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details)

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Inventories, net - Summary of Inventories, Net of Allowance for Obsolescence (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Sep. 29, 2018
Mar. 31, 2018
Inventory Disclosure [Abstract]      
Raw materials $ 136,879 $ 117,539 $ 117,370
Work in progress 58,529 35,691 40,491
Finished goods 305,569 263,845 293,988
Supplies 16,181 10,748 13,673
Total inventories, net $ 517,158 $ 427,823 $ 465,522